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logical notation

 
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brimstone
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PostPosted: Tue Jun 17, 2003 12:09 pm    Post subject: logical notation Reply with quote

I'm new with OpenOffice Math, but after using it for awhile there doesn't seem to be a way to do UNION or INTERSECTION representation over sets. Am I missing something?
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brimstone
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PostPosted: Tue Jun 17, 2003 12:12 pm    Post subject: addendum Reply with quote

To be more specific. I want to take UNION or INTERSECTION over an arbitrary number of sets. Math does offer a way to show union or intersection over 2 sets.
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libertan
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Joined: 14 Apr 2003
Posts: 30
Location: Seoul, Korea

PostPosted: Tue Jun 17, 2003 4:46 pm    Post subject: Reply with quote

OOo Math supports union and intersection over any arbitrary number of sets, clearly. Note that the operators(union intersection) are binary - giving a example;

Code:

A intersection B intersection C newline
{A intersection B} intersection C newline  (same above)
A union B intersection C newline
A union B union C
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marco72r23
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Joined: 10 Jun 2003
Posts: 8
Location: Italy

PostPosted: Wed Jun 18, 2003 3:16 am    Post subject: a solution Reply with quote

If you would like to create something like a sum operator you should
first: create a personal symbol called "yoursymbol" in the symbol dialog
then: use this code:
Code:
oper %yoursymbol from {i=1} to n yourset_i

I'was succesfull using new big operators and sets when I was writing a work on probability theory.

other examples could be:
Code:
oper %yoursymbol from {i in indexesset} yourset_i

and you can use also a saving vertical space form:
Code:
oper %yoursymbol_{i in indexesset} yourset_i


Don't forget you can use as big operators any character in your computer, but you don't need to define a personal symbol for those charcters normally accessible via keyboard.
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Marco Biffino
Firenze, Italy
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